CN112290991A - Relay satellite tracking performance test method and device - Google Patents
Relay satellite tracking performance test method and device Download PDFInfo
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- CN112290991A CN112290991A CN202011061760.5A CN202011061760A CN112290991A CN 112290991 A CN112290991 A CN 112290991A CN 202011061760 A CN202011061760 A CN 202011061760A CN 112290991 A CN112290991 A CN 112290991A
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Abstract
The embodiment of the invention discloses a method and a device for testing the tracking performance of a relay satellite. The method comprises the following steps: in the process of carrying out a ground test, a communication link between a relay satellite and a user terminal is established; in the process of controlling the user terminal to be in a motion state, acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite; determining a beam pointing direction of an antenna of the user terminal at a next time based on the spatial position data information and the satellite orbit data information; controlling an antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite; and determining the tracking performance of the relay satellite according to the tracking result. The embodiment of the invention can solve the user terminal equivalence problem in the outfield test for verifying the capturing and tracking performance of the relay satellite before leaving the factory.
Description
Technical Field
The invention relates to the technical field of relay satellite tests, in particular to a method and a device for testing the tracking performance of a relay satellite.
Background
The task is derived from a technical summary obtained by a relay satellite system external field test. The relay satellite works on a GEO orbit and provides data transfer service for the target aircrafts in the medium and low orbits, the target aircrafts in the medium and low orbits are used as service objects of the relay satellite and are collectively called relay user terminals (called user terminals for short), and the ground measurement and control station can transmit measurement and control information, voice or image information and the like to the user terminals through a forward link and the relay satellite through an antenna of the ground station; and similarly, the user terminal realizes the purpose of transmitting the frames of return telemetering, voice or image information and the like to the ground measurement and control station through the return link and the relay satellite so as to realize space-based measurement and control. The premise of information transmission is that a reliable transmission link must be established, and how to realize bidirectional acquisition of a link antenna between relay satellites and a user terminal antenna is involved. With the update iteration of the relay satellite, the communication capacity of the relay satellite is larger, the system is more complex, and the equivalent verification of the dynamic tracking between the relay and the user terminal on the ground of the relay satellite system becomes more difficult.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the relay satellite tracking performance test method and the relay satellite tracking performance test device are provided.
In order to solve the technical problem, the invention provides a method for testing the tracking performance of a relay satellite, which comprises the following steps:
in the process of carrying out a ground test, a communication link between a relay satellite and a user terminal is established;
in the process of controlling the user terminal to be in a motion state, acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite;
determining a beam pointing direction of an antenna of the user terminal at a next time based on the spatial position data information and the satellite orbit data information;
controlling an antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite;
and determining the tracking performance of the relay satellite according to the tracking result.
Optionally, the establishing a communication link between the relay satellite and the user during the ground test includes:
when a ground test is carried out, the relay satellite is placed in a semi-open wave-absorbing dark room of a test building, and the user terminal is placed in a hanging cabin in a scanning tower on the opposite side of the test building;
and establishing a communication link between the relay satellite and a user.
Optionally, before the acquiring the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in the motion state, the method further includes:
calculating to obtain the space distance between the relay satellite and the user terminal according to a field and distance conversion algorithm of a paraboloid of the circular reflector antenna;
verifying whether the space distance meets the test requirements;
and under the condition that the spatial distance meets the test requirement, executing the step of acquiring the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in the motion state.
Optionally, the obtaining, in the process of controlling the user terminal to be in a motion state, spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite includes:
in the process that the user terminal is in a motion state, acquiring spatial position data information of the user terminal at the current moment according to a satellite spatial position receiver; the spatial position data information comprises time information, spatial coordinate information and three-axis speed information;
and acquiring the instantaneous orbit number of the satellite corresponding to the relay satellite.
Optionally, the determining a beam pointing direction of the antenna of the user terminal at the next time based on the spatial position data information and the satellite orbit data information includes:
calculating the satellite position speed of the relay satellite under the J2000 inertial system according to the instantaneous orbit number of the satellite;
calculating the terminal position speed of the user terminal under a J2000 inertial system according to the spatial position data information;
calculating to obtain the beam direction of the antenna of the user terminal at the next moment based on the satellite position speed, the terminal position speed and the coordinate transformation mode; the beam pointing includes a beam pointing angle of the user terminal to an X-axis motor of the relay satellite and a beam pointing angle of the user terminal to a Y-axis motor of the relay satellite.
In order to solve the above technical problem, an embodiment of the present invention further provides a relay satellite tracking performance testing apparatus, including:
the communication link establishing module is used for establishing a communication link between the relay satellite and the user terminal in the process of carrying out the ground test;
the data information acquisition module is used for acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in a motion state;
a beam pointing determination module, configured to determine a beam pointing direction of an antenna of the user terminal at a next time based on the spatial location data information and the satellite orbit data information;
the satellite pointing tracking module is used for controlling the antenna of the user terminal to point to the beam direction and carrying out pointing tracking on the relay satellite;
and the tracking performance determining module is used for determining the tracking performance of the relay satellite according to the tracking result.
Optionally, the communication link establishing module includes:
the satellite terminal placing unit is used for placing the relay satellite in a semi-open wave-absorbing dark room in an electric measurement workshop of a test building and placing the user terminal in a hanging cabin in a scanning tower on the right opposite side of the test building during ground test;
and the communication link establishing unit is used for establishing a communication link between the relay satellite and the user.
Optionally, the method further comprises:
the spatial distance calculation module is used for calculating and obtaining the spatial distance between the relay satellite and the user terminal according to a field of a paraboloid of the circular reflector antenna and a distance conversion algorithm;
the spatial distance verification module is used for verifying whether the spatial distance meets the test requirement;
and the data acquisition executing module is used for executing the data information acquiring module under the condition that the space distance is determined to meet the test requirement.
Optionally, the data information obtaining module includes:
a data information obtaining unit, configured to obtain, according to a satellite spatial position receiver, spatial position data information of the user terminal at a current time while the user terminal is in a motion state; the spatial position data information comprises time information, spatial coordinate information and three-axis speed information;
and the orbit root acquiring unit is used for acquiring the instantaneous orbit root of the satellite corresponding to the relay satellite.
Optionally, the beam pointing determination module includes:
the satellite speed calculation unit is used for calculating the satellite position speed of the relay satellite under the J2000 inertial system according to the instantaneous orbit number of the satellite;
the terminal speed calculating unit is used for calculating and obtaining the terminal position speed of the user terminal under a J2000 inertial system according to the spatial position data information;
the beam direction calculation unit is used for calculating and obtaining the beam direction of the antenna of the user terminal at the next moment based on the satellite position speed, the terminal position speed and the coordinate transformation mode; the beam pointing includes a beam pointing angle of the user terminal to an X-axis motor of the relay satellite and a beam pointing angle of the user terminal to a Y-axis motor of the relay satellite.
Compared with the prior art, the invention has the advantages that: the embodiment of the invention provides a method and a device for testing the tracking performance of a relay satellite. Establishing a communication link between a relay satellite and a user terminal in the process of carrying out a ground test; in the process of controlling the user terminal to be in a motion state, acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite; determining a beam pointing direction of an antenna of the user terminal at a next time based on the spatial position data information and the satellite orbit data information; controlling an antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite; and determining the tracking performance of the relay satellite according to the tracking result. The embodiment of the invention can solve the user terminal equivalence problem in the outfield test for verifying the capturing and tracking performance of the relay satellite before leaving the factory.
Drawings
Fig. 1 is a flowchart illustrating steps of a method for testing tracking performance of a relay satellite according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a relay satellite test scenario provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of an antenna field varying with distance according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a relationship between a beam width and a directivity of an antenna main lobe according to a distance according to an embodiment of the present invention;
fig. 5 is a schematic view of the pointing direction of an antenna coordinate system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a user star distance increment calculation according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the motion of a pod after loading an array in accordance with an embodiment of the present invention;
fig. 8 is a schematic diagram of an array plane track quantized by a terminal according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a whole process curve of a relay satellite capturing and tracking user terminal according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an equivalent system of a user terminal according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a BPSK demodulation constellation and a waveform provided in an embodiment of the present invention;
fig. 12 is a schematic diagram of a QPSK demodulation constellation and waveforms according to an embodiment of the present invention;
fig. 13 is a schematic diagram of an 8PSK demodulation constellation diagram and waveforms according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a BPSK, QPSK, and 8PSK signal plus noise simulation constellation according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a method for testing the tracking performance of a relay satellite according to an embodiment of the present invention.
Detailed Description
Example one
Referring to fig. 1, a flowchart illustrating steps of a method for testing the tracking performance of a relay satellite according to an embodiment of the present invention is shown, and as shown in fig. 1, the method for testing the tracking performance of a relay satellite may specifically include the following steps:
step 101: and in the process of carrying out the ground test, establishing a communication link between the relay satellite and the user terminal.
The embodiment of the invention can be applied to a scene of ground test on the tracking performance of the relay satellite.
In the process of conducting ground test, a communication link between the relay satellite and the user and the terminal can be established, specifically, as shown in fig. 2, a ground measurement and control station carries out measurement and control to ensure that the relay satellite stably runs, a ground station antenna always points to a ground antenna of the relay satellite, the user terminal points to the direction of the relay satellite through program guidance in a visible arc section according to an orbit, when the user terminal enters a beacon signal wave radiated by the relay satellite in all weather, after the signal intensity of a forward tracking channel of the user terminal antenna reaches a certain threshold value), the user terminal is automatically switched to an automatic tracking mode, the user terminal keeps dynamic tracking with the relay satellite through an angular error system under dynamic motion, and sends a return data transmission signal after the link is stable, the relay satellite sends a return signal according to a served user terminal, also according to the angular error tracking system, and after the acquisition tracking-front return link is established for the user terminal, information interaction is carried out, and information ferry of the user terminal is completed.
In order to carry out effective verification on the ground, the equivalence of a moving carrier of a user terminal and the equivalence of data sources sent by various terminals are required, during the ground test, the relay satellite 3 is placed in a semi-open wave-absorbing darkroom of a test building, and the user terminal 2 is placed in a nacelle in a scanning tower frame 1 on the opposite side of the test building.
The nacelle is arranged on a vertical column of the scanning tower, the nacelle can move up and down on the vertical column, the vertical column can move left and right, so that two-dimensional movement of the nacelle in the plane of the scanning tower is achieved, the nacelle guarantees power supply, illumination, communication and temperature and humidity monitoring and control, the relay user terminal equipment is placed in the nacelle and connected, the relay user terminal antenna is fixedly connected to a disc flange outside the nacelle, and a transceiving interface of the relay user terminal antenna (including a rotating mechanism) is connected to equipment in the nacelle through a cable, so that a user terminal system is built. The pod moves according to a certain track, so that the motion of the relay user terminal is realized, and a dynamic tracking target object is formed for the relay satellite. And the electrification and state monitoring of the instruments and equipment in the remote lifting cabin are realized by relying on an optical fiber network.
Of course, before establishing the communication link, link budget is also needed to ensure that the communication link can meet the experimental level adjustment range, and specifically, the electromagnetic signal transmission signal is attenuated in the air, so the EIRP and the signal level adjustment range of the user terminal need to be calculated. The calculation is performed according to equation (2).
A＝20log(L)+20log(f)+32.44 (2)
Wherein:
l is distance, and the unit is km;
f is frequency in MHz;
and substituting the test distance and the test transmission frequency into a formula 2, and calculating to obtain the maximum signal output by the user terminal as the maximum input signal level covering the relay satellite. The signal adjustment range meets the dynamic adjustment range required by the test.
After the communication link between the relay satellite and the user terminal is established, step 102 is performed.
Step 102: and in the process of controlling the user terminal to be in a motion state, acquiring the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite.
After a communication link between the relay satellite and the user terminal is established, the user terminal can be controlled to be in a motion state, and then the tracking performance of the relay satellite is tested under the condition that the terminal is in the motion state.
In the process of controlling the user terminal to be in the motion state, the spatial position data information corresponding to the user terminal and the satellite orbit data information of the relay satellite can be acquired.
Of course, before acquiring the spatial position data information and the satellite orbit data information of the relay satellite, it may also be verified whether the spatial distance meets the test requirement, and specifically, the detailed description may be made in conjunction with the following specific implementation manner.
In a specific implementation manner of the present invention, before the step 102, the method may further include:
step A1: calculating to obtain the space distance between the relay satellite and the user terminal according to a field and distance conversion algorithm of a paraboloid of the circular reflector antenna;
step A2: verifying whether the space distance meets the test requirements;
step A3: and under the condition that the spatial distance meets the test requirement, executing the step of acquiring the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in the motion state.
In the embodiment of the invention, feasibility analysis is carried out on the test distance during the test. The field and distance transformation of the paraboloid of the circular reflector antenna can calculate whether the distance between the user terminal and the relay satellite meets the test requirement or not. The schematic diagram of the antenna field versus distance transformation is shown in fig. 3.
The angular distribution of the field is independent of distance. Strictly speaking, this characteristic is only obtained when the distance from the antenna is infinite, but at a certain distance, the angular distribution of the field is within the allowable range of the angular distribution error from infinity, and the region from the point to infinity is considered to be the boundary distance R with the near field, which satisfies the requirement of formula (1):
wherein: d is the diameter of the antenna aperture;
λ is the wavelength of the signal.
According to the related theoretical research of near field test, the distance can be shortened to 1/4R0The test error caused by the shortened distance is small, and the influence on the test result can be ignored. Therefore, the test distance can meet the theoretical requirement. The main lobe beam width and directivity of the antenna as a function of distance are shown in fig. 4.
When the spatial distance between the relay satellite and the user terminal is verified to meet the experimental requirements, step 102 is executed.
The process for acquiring the spatial position data information and the satellite trajectory data information may be described in detail in conjunction with the following specific implementation.
In another specific implementation manner of the present invention, the step 102 may include:
substep B1: in the process that the user terminal is in a motion state, acquiring spatial position data information of the user terminal at the current moment according to a satellite spatial position receiver; the spatial position data information comprises time information, spatial coordinate information and three-axis speed information;
substep B2: and acquiring the instantaneous orbit number of the satellite corresponding to the relay satellite.
In the embodiment of the invention, to complete the verification of the tracking performance of the outfield of the relay satellite, a pointing algorithm for the user terminal to point to the relay satellite is calculated. The calculation of the user terminal antenna pointing direction is carried out by the relay space position data and the relay satellite orbit data, the antenna servo controller receives the user terminal space position data and the relay satellite orbit data provided by the satellite service computer bus, the orbit prediction calculation is carried out, the beam pointing direction of the antenna at the next moment is calculated according to the position information calculated by the orbit prediction result, the rotation pointing angle of the antenna is controlled, and the pointing tracking of the relay satellite is realized. Therefore, to realize the direction tracking of the relay, the user terminal needs to have three input conditions: the position information data of the user terminal, the instantaneous orbit number of the relay satellite and the attitude data of the user terminal installation platform satellite.
A) Location information data of user terminal
The position information data of the user terminal is transmitted from the satellite spatial position receiver by satellite affairs, usually 1 time per 1 second, and uses a WGS84 coordinate system, and the parameters include spatial position data time (UTC time), X-axis, Y-axis, and Z-axis coordinates, X-axis speed Xv, Y-axis speed Yv, and Z-axis speed Zv.
B) Instantaneous orbital element of relay satellite
The instantaneous orbit root of the relay satellite is noted on the ground once in 24 hours, and the parameters comprise root epoch (Beijing time, precision 0.001s), orbit semimajor axis a (meter), orbit eccentricity e, orbit inclination angle i (degree), ascension point right ascension channel omega (degree), argument omega (degree) of the near place and argument M (degree) of the level and the near point.
C) Attitude data
The attitude data is forwarded by the satellite affairs, usually 1 time per second, and comprises six parameters of yaw angle, pitch angle, roll angle, yaw angular velocity, pitch angular velocity and roll angular velocity.
After acquiring the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite, step 103 is performed.
Step 103: and determining the beam pointing direction of the antenna of the user terminal at the next moment based on the spatial position data information and the satellite orbit data information.
After the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite are obtained, the beam direction of the antenna of the user terminal at the next time may be determined based on the spatial position data information and the satellite orbit data information corresponding to the relay satellite, and specifically, the following specific implementation manner may be combined for detailed description.
In another specific implementation manner of the present invention, the step 103 may include:
substep C1: calculating the satellite position speed of the relay satellite under the J2000 inertial system according to the instantaneous orbit number of the satellite;
substep C2: calculating the terminal position speed of the user terminal under a J2000 inertial system according to the spatial position data information;
substep C3: calculating to obtain the beam direction of the antenna of the user terminal at the next moment based on the satellite position speed, the terminal position speed and the coordinate transformation mode; the beam pointing includes a beam pointing angle of the user terminal to an X-axis motor of the relay satellite and a beam pointing angle of the user terminal to a Y-axis motor of the relay satellite.
In the embodiment of the invention, the calculation process of the pointing algorithm firstly calculates the lower position velocity of the J2000 coordinate system of the user terminal and the lower position velocity of the J2000 coordinate system of the relay satellite, and then calculates the antenna pointing direction according to the lower position velocities of the two in the J2000 coordinate system.
A) Calculating the position speed of the J2000 coordinate system of the user terminal through the spatial position data
The spatial position data is transmitted from a satellite spatial position receiver by a satellite, is generally transmitted 1 time per second, and uses a WGS84 coordinate system including spatial position data time (UTC time), X-axis, Y-axis, Z-axis coordinates, X-axis velocity Xv, Y-axis velocity Yv, and Z-axis velocity Zv.
B) Calculating the position and speed of the J2000 coordinate system of the relay satellite
The orbit forecasting of the relay satellite adopts a calculation method of two-body extrapolation to calculate the orbit number of the relay satellite and convert the orbit number into the position velocity under a J2000 inertial system.
Under the two-body model, a, e, i, Ω, ω are all constant, and M varies with time: m is M0+n·(t-t0)
μ＝398600.4415e9
The position and the speed of the relay star J2000 in the inertial system can be calculated through a, e, i, omega and M.
The pointing vector from the user terminal to the relay satellite under the J2000.0 equatorial coordinate system is set as
Velocity vector of
The pointing vector under the orbital coordinates of the user terminal is
Velocity vector of
Then there are:
wherein R isRTNThe definition is as follows:
is provided with
Is the velocity vector of the equatorial coordinate system of the satellite J2000.0,
xS,yS,zSis the equatorial coordinate system position vector of the satellite J2000.0.
Then
C) Calculating antenna pointing
And completing the position and speed of the user terminal and the relay satellite under the condition of two J2000 inertial systems of the satellites. And then, calculating the pointing angle of the antenna through coordinate transformation, wherein the specific process is as follows:
and calculating a pointing vector of the user terminal relative to the relay satellite according to the process of J2000 inertial system → a user terminal orbit coordinate system → a user terminal body coordinate system → a user terminal antenna reference coordinate system → a user terminal antenna coordinate system → an antenna X, Y axis angle.
In performing the conversion of the J2000 inertial coordinate system to the user orbit coordinate system, the following processing is required:
the pointing vector from the user terminal to the relay satellite under the J2000.0 equatorial coordinate system is set as
Velocity vector of
The pointing vector under the orbital coordinates of the user terminal is
Velocity vector of
Then there is
Wherein R isRTNThe definition is as follows:
is provided with
Is the velocity vector of the equatorial coordinate system of the satellite J2000.0,
xS,yS,zSis the equatorial coordinate system position vector of the satellite J2000.0.
Then:
after calculating the directional vector in the satellite orbit coordinate system, the directional vector in the antenna coordinate system can be calculated by considering the satellite attitude and the antenna installation position, as shown in fig. 5.
After the pointing vector is calculated, the pointing angle can be calculated according to the following formula.
Therefore, the rotation angles from the user terminal to the X-axis motor and the Y-axis motor of the relay satellite are calculated.
Next, the problem of how to invert the pointing angle calculated by the algorithm to the motion trajectory on the scanning tower is solved. In order to simplify and not lose generalization, a small segment of orbital motion at a certain moment is intercepted by utilizing the differential thought, and the same moment is carried outHow the single axis angular (X-axis or Y-axis, here exemplified by the X-axis) orientation translates into a speed increment problem at intervals (e.g., 1 second) is illustrated. As shown in fig. 6, it can be seen from fig. 6 that, knowing the distances h between the relay satellite and the user terminal and the angles from T0 to T3 pointing to the relay satellite, the distances a, b and c can be calculated according to the trigonometric function arctan (α i) relationship, so as to obtain the distances a, b and c, and thus the distance increment, L and L of the user terminal in the same Δ T time can be calculatedAB(LAB＝c-b)、LBC(LBC＝b-a)、LCD(LCDA). The Y-axis pointing angle can also be obtained by the same calculation method as the example increment. An array of X, Y distance increments of the same separation Δ t is thus acquired, and this data is injected into the scanning tower control system. In order to realize complete equivalence, the algorithm needs to be compared and verified, and the comparison and verification of the algorithm depends on the STK simulation result and the result obtained by the algorithm for comparison. And programming through an algorithm to obtain data and comparing the data with the simulation result of the STK simulation software. The position pointing direction of the user terminal in the time period can be calculated by setting the orbit parameters of the relay satellite and the user terminal.
Step 104: and controlling the antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite.
Step 105: and determining the tracking performance of the relay satellite according to the tracking result.
After the beam direction is determined, the antenna of the user terminal can be controlled to point to the beam direction, and the direction tracking of the relay satellite is performed, so that the tracking performance of the relay satellite is determined according to the tracking result.
And (3) injecting the generated trajectory data into a scanning tower control program through EXCEL, enabling the program loading array to move according to point positions, and enabling the nacelle to move schematically after loading the array as shown in FIG. 7. The diagram of the array planar trace quantized by a certain user terminal is shown in fig. 8.
According to the terminal test method, the track parameters of the user terminal are injected into the control system, and after the track starting point of the user terminal is offset by a certain angle (taking the pitching direction as an example), spiral scanning is started at the same time. Scanning signals entering a user terminal, when a capture threshold is reached, program-controlled tracking is switched to a self-defined tracking mode to complete the whole capture tracking process, and the process is shown in fig. 9.
The user terminal multi-mode data generates a waveform file through programming, is remotely injected into a waveform generator through an optical fiber network, is externally modulated by a vector signal source to complete modulation, and the output signal of the vector signal source is accessed to a relay antenna transmitting interface outside a hanging cabin through a radio frequency signal. The connection relationship is shown in fig. 10.
Through debugging, the multi-mode data source of the user terminal can realize the generation of BPSK/QPSK/8PSK signals, IQ waveforms are undistorted, frequency spectrums are normal, demodulation is normal through high-speed demodulation equipment, and data waveforms and demodulation constellations are shown in figures 11-13.
The program can also add white gaussian noise to the signal-to-noise function to change the signal quality. The BPSK, QPSK and 8PSK signals were simulated by matlab at SNR 40, 20, 10, 5, respectively, and the simulation results are shown in fig. 14.
From simulation results, the smaller the SNR figure, the more divergent the constellation, which is consistent with the expected results. The method comprises the steps of injecting a 'bin' file generated by a program and having a noise adding function into a waveform generator in a TCP mode through an LNA (low-noise amplifier) interface, triggering the waveform generator through a signal external clock, modulating the waveform generator by a vector signal source, and transmitting the modulated waveform to a user terminal antenna after remote attenuation.
According to the relay satellite tracking performance test method provided by the embodiment of the invention, a communication link between a relay satellite and a user terminal is established in the ground test process; in the process of controlling the user terminal to be in a motion state, acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite; determining a beam pointing direction of an antenna of the user terminal at a next time based on the spatial position data information and the satellite orbit data information; controlling an antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite; and determining the tracking performance of the relay satellite according to the tracking result. The embodiment of the invention can solve the user terminal equivalence problem in the outfield test for verifying the capturing and tracking performance of the relay satellite before leaving the factory.
Example two
Referring to fig. 15, a schematic structural diagram of a relay satellite tracking performance testing apparatus provided in an embodiment of the present invention is shown, and as shown in fig. 15, the relay satellite tracking performance testing apparatus may specifically include the following modules:
a communication link establishing module 201, configured to establish a communication link between a relay satellite and a user terminal in a process of performing a ground test;
a data information obtaining module 202, configured to obtain, in a process of controlling the user terminal to be in a motion state, spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite;
a beam pointing direction determining module 203, configured to determine a beam pointing direction of the antenna of the user terminal at a next time based on the spatial location data information and the satellite orbit data information;
a satellite pointing tracking module 204, configured to control an antenna of the user terminal to point to the beam direction, and perform pointing tracking on the relay satellite;
and the tracking performance determining module 205 is configured to determine the tracking performance of the relay satellite according to the tracking result.
Optionally, the communication link establishing module 201 includes:
the satellite terminal placing unit is used for placing the relay satellite in a semi-open wave-absorbing dark room of a test building and placing the user terminal in a hanging cabin in a scanning tower on the right opposite side of the test building during ground test;
and the communication link establishing unit is used for establishing a communication link between the relay satellite and the user.
Optionally, the method further comprises:
the spatial distance calculation module is used for calculating and obtaining the spatial distance between the relay satellite and the user terminal according to a field of a paraboloid of the circular reflector antenna and a distance conversion algorithm;
the spatial distance verification module is used for verifying whether the spatial distance meets the test requirement;
and a data obtaining executing module, configured to execute the data information obtaining module 202 when it is determined that the spatial distance meets the test requirement.
Optionally, the data information obtaining module 202 includes:
a data information obtaining unit, configured to obtain, according to a satellite spatial position receiver, spatial position data information of the user terminal at a current time while the user terminal is in a motion state; the spatial position data information comprises time information, spatial coordinate information and three-axis speed information;
and the orbit root acquiring unit is used for acquiring the instantaneous orbit root of the satellite corresponding to the relay satellite.
Optionally, the beam pointing determination module 203 includes:
the satellite speed calculation unit is used for calculating the satellite position speed of the relay satellite under the J2000 inertial system according to the instantaneous orbit number of the satellite;
the terminal speed calculating unit is used for calculating and obtaining the terminal position speed of the user terminal under a J2000 inertial system according to the spatial position data information;
the beam direction calculation unit is used for calculating and obtaining the beam direction of the antenna of the user terminal at the next moment based on the satellite position speed, the terminal position speed and the coordinate transformation mode; the beam pointing includes a beam pointing angle of the user terminal to an X-axis motor of the relay satellite and a beam pointing angle of the user terminal to a Y-axis motor of the relay satellite.
According to the relay satellite tracking performance testing device provided by the embodiment of the invention, a communication link between the relay satellite and the user terminal is established in the ground test process; in the process of controlling the user terminal to be in a motion state, acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite; determining a beam pointing direction of an antenna of the user terminal at a next time based on the spatial position data information and the satellite orbit data information; controlling an antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite; and determining the tracking performance of the relay satellite according to the tracking result. The embodiment of the invention can solve the user terminal equivalence problem in the outfield test for verifying the capturing and tracking performance of the relay satellite before leaving the factory.
It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Thus, it will be appreciated by those skilled in the art that the invention may be modified and equivalents may be substituted; all technical solutions and modifications thereof which do not depart from the spirit and technical essence of the present invention should be covered by the scope of the present patent.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A relay satellite tracking performance test method is characterized by comprising the following steps:
in the process of carrying out a ground test, a communication link between a relay satellite and a user terminal is established;
in the process of controlling the user terminal to be in a motion state, acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite;
determining a beam pointing direction of an antenna of the user terminal at a next time based on the spatial position data information and the satellite orbit data information;
controlling an antenna of the user terminal to point to the beam direction, and carrying out direction tracking on the relay satellite;
and determining the tracking performance of the relay satellite according to the tracking result.
2. The method of claim 1, wherein establishing a communication link between the relay satellite and the user during the ground test comprises:
when a ground test is carried out, the relay satellite is placed in a semi-open wave-absorbing dark room of a test building, and the user terminal is placed in a hanging cabin in a scanning tower on the opposite side of the test building;
and establishing a communication link between the relay satellite and a user.
3. The method according to claim 1, before said obtaining spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in the motion state, further comprising:
calculating to obtain the space distance between the relay satellite and the user terminal according to a field and distance conversion algorithm of a paraboloid of the circular reflector antenna;
verifying whether the space distance meets the test requirements;
and under the condition that the spatial distance meets the test requirement, executing the step of acquiring the spatial position data information corresponding to the user terminal and the satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in the motion state.
4. The method according to claim 1, wherein the obtaining spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in a motion state comprises:
in the process that the user terminal is in a motion state, acquiring spatial position data information of the user terminal at the current moment according to a satellite spatial position receiver; the spatial position data information comprises time information, spatial coordinate information and three-axis speed information;
and acquiring the instantaneous orbit number of the satellite corresponding to the relay satellite.
5. The method of claim 4, wherein said determining the beam pointing direction of the antenna of the user terminal at the next time based on the spatial location data information and the satellite trajectory data information comprises:
calculating the satellite position speed of the relay satellite under the J2000 inertial system according to the instantaneous orbit number of the satellite;
calculating the terminal position speed of the user terminal under a J2000 inertial system according to the spatial position data information;
calculating to obtain the beam direction of the antenna of the user terminal at the next moment based on the satellite position speed, the terminal position speed and the coordinate transformation mode; the beam pointing includes a beam pointing angle of the user terminal to an X-axis motor of the relay satellite and a beam pointing angle of the user terminal to a Y-axis motor of the relay satellite.
6. A relay satellite tracking performance test device is characterized by comprising:
the communication link establishing module is used for establishing a communication link between the relay satellite and the user terminal in the process of carrying out the ground test;
the data information acquisition module is used for acquiring spatial position data information corresponding to the user terminal and satellite orbit data information corresponding to the relay satellite in the process of controlling the user terminal to be in a motion state;
a beam pointing determination module, configured to determine a beam pointing direction of an antenna of the user terminal at a next time based on the spatial location data information and the satellite orbit data information;
the satellite pointing tracking module is used for controlling the antenna of the user terminal to point to the beam direction and carrying out pointing tracking on the relay satellite;
and the tracking performance determining module is used for determining the tracking performance of the relay satellite according to the tracking result.
7. The apparatus of claim 6, wherein the communication link establishing module comprises:
the satellite terminal placing unit is used for placing the relay satellite in a semi-open wave-absorbing dark room of a test building and placing the user terminal in a hanging cabin in a scanning tower on the right opposite side of the test building during ground test;
and the communication link establishing unit is used for establishing a communication link between the relay satellite and the user.
8. The apparatus of claim 6, further comprising:
the spatial distance calculation module is used for calculating and obtaining the spatial distance between the relay satellite and the user terminal according to a field of a paraboloid of the circular reflector antenna and a distance conversion algorithm;
the spatial distance verification module is used for verifying whether the spatial distance meets the test requirement;
and the data acquisition executing module is used for executing the data information acquiring module under the condition that the space distance is determined to meet the test requirement.
9. The apparatus of claim 6, wherein the data information obtaining module comprises:
a data information obtaining unit, configured to obtain, according to a satellite spatial position receiver, spatial position data information of the user terminal at a current time while the user terminal is in a motion state; the spatial position data information comprises time information, spatial coordinate information and three-axis speed information;
and the orbit root acquiring unit is used for acquiring the instantaneous orbit root of the satellite corresponding to the relay satellite.
10. The apparatus of claim 9, wherein the beam pointing determination module comprises:
the satellite speed calculation unit is used for calculating the satellite position speed of the relay satellite under the J2000 inertial system according to the instantaneous orbit number of the satellite;
the terminal speed calculating unit is used for calculating and obtaining the terminal position speed of the user terminal under a J2000 inertial system according to the spatial position data information;
the beam direction calculation unit is used for calculating and obtaining the beam direction of the antenna of the user terminal at the next moment based on the satellite position speed, the terminal position speed and the coordinate transformation mode; the beam pointing includes a beam pointing angle of the user terminal to an X-axis motor of the relay satellite and a beam pointing angle of the user terminal to a Y-axis motor of the relay satellite.
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